<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		
		<script>
			// 先算乘除,再算加减
			var result = 20 * (5 + 10) * 2 - 20;
			console.log(result);
			
			// 上午练习
			var a = 10;
			var b = a++ + ++a;
			
		</script>
	</body>
</html>
